盾构侧穿桥梁基础的施工影响分析及其控制研究
徐前卫1崔越榜1王尉行1龚振宇2黄杉2路林海3邢慧堂3
Construction Influence Analysis and Control Measures of Shield Tunnel Side-crossing Adjacent Bridge Foundation
XU QianweiCUI YuebangWANG WeixingGONG ZhenyuHUANG ShanLU LinhaiXING Huitang
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作者信息:1.1.同济大学道路与交通工程教育部重点实验室， 201804， 上海；
2.2.中铁五局电务城通公司， 410205， 长沙；
3.3.济南轨道交通集团公司， 250101， 济南
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Affiliation:Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.05.006
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中图分类号/CLCN:U25
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栏目/Col:研究报告
摘要:
北京地铁8号线天桥站—永定门外站区间隧道施工过程中，盾构需要于K34+422.094~+534.308处近距离侧穿永定门西桥，穿越段地层以砂卵石地层为主。隧道在施工至K34+506.308里程时，距永定门桥最近处仅9.2 m，施工对桥梁影响较大，故有必要对盾构施工引发的桥梁结构安全进行评估。根据对盾构侧穿桥梁基础施工过程的动态模拟分析，得出了盾构穿越施工导致地层和桥梁结构变形过大的结论。鉴于此，提出了在靠近桥梁一侧的左线盾构隧道周围采取局部注浆的加固方案和对盾构掘进参数管理的控制措施。进一步的计算分析和现场实测结果表明，按上述工程措施施工，地层和桥梁结构变形均得到有效控制，从而确保了本工程的顺利施工，并为今后类似工程提供了借鉴和参考。
Abstracts:
During the construction of the interval tunnel from Tianqiao station to Yongdingmen Wai station of Beijing Metro Line 8, the shield machine has to cross the West Yongdingmen Bridge in close distance at the mileage from K34+422.094 to K34+534.308. The stratum at the crossing section is mainly sandy cobble soil. The minimum net distance between the bridge and the shield tunnel is only 9.2 m when the shield arrives at the mileage of K34+506.308, of which the construction has relatively large impact on the bridge structure. Therefore, it is necessary to evaluate the safety of the bridge structure caused by shield construction. According to the dynamic simulation analysis of the construction process of shield machine sidecrossing bridge foundation, conclusion is obtained that the deformation of the stratum and the bridge structure caused by shield tunnel sidecrossing construction is too large. In view of this, a local grouting scheme to reinforce the soil around the left tunnel near the bridge and control measures for the management of shield tunneling parameters are proposed. Both calculation analysis and field monitoring results show that the deformation of the stratum and bridge structure can be effectively controlled if the above engineering measures are taken, thus smooth construction of this project is ensured, providing reference for similar projects in the future.
引文 / Ref:
徐前卫，崔越榜，王尉行，等.盾构侧穿桥梁基础的施工影响分析及其控制研究[J].城市轨道交通研究，2021，24（5）：26.
XU Qianwei，CUI Yuebang，et al.WANG Weixing，Construction Influence Analysis and Control Measures of Shield Tunnel Side-crossing Adjacent Bridge Foundation[J].Urban mass transit，2021，24（5）：26.
XU Qianwei，CUI Yuebang，et al.WANG Weixing，Construction Influence Analysis and Control Measures of Shield Tunnel Side-crossing Adjacent Bridge Foundation[J].Urban mass transit，2021，24（5）：26.
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